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Full text of "Text Book Of Mechanical Engineering"

Dividing Centres.

181

by the carrier A, which is screwed on the right hand centre,
fixed in spindle B B. The spindle BB may be turned through any
desired angle by the worm c and wheel D. E is a steel drum
provided with small holes, representing various exact divisions of
its circumference, and the point F can enter any of these, so as to
set the spindle in the desired position. Knowing the number of
spaces in the wheel to be cut, or flutes to the rimer, dram E,
called a dividing plate, can be placed in each position in turn,
and a cut taken. The heads G and H can be either bolted
directly to the table, or packed to any convenient height, to
accommodate a larger piece of work; or H may be bolted to the

CD

CD

CD

table, G packed, and the centres placed at an angle, as shewn by
dotted lines, useful for tapered work. This is obtained by
releasing the screws j and L, when centre K may dip, and B be
tilted between the cheeks of H. B may be further turned at any
angle up to the vertical, for milling cutters of various angles, and
E has a conical socket to hold the mandrel supporting the work.
Similar centres are used when milling spiral cutters or twist